合并/相互作用星系中年轻星团的双子光谱巡天。IV。斯蒂芬五重星系
Gemini Spectroscopic Survey of Young Star Clusters in Merging/Interacting Galaxies. IV. Stephan's Quintet
摘要：
我们提出了一个光谱调查的21个年轻的大质量星系团和复合体和一个潮汐矮星系候选人（TDG）在斯蒂芬的五重奏，相互作用的紧凑的星系群。所有选定的目标都位于该系统的主要星系之外，并与潮汐碎片有关。我们发现了年龄在几百万年到1.25亿年之间的星团，并证实了Fedotov等人（2011）通过HST测光估计的年龄，以及它们模拟的五重星系相互作用历史。许多星系团被发现是相对长寿的，因为它们的光谱推导出的年龄，而它们的高质量表明它们可能会演变成星系际星系团。其中一个星团T118特别令人感兴趣，因为它的年龄（\sim 1.25亿年）、质量（\sim 2 \times 10^6 M \odot）和位置都在年轻潮汐尾的最外端。与星系盘中观察到的星团（参考\sim 3 - 4 pc）相比，这个星团似乎相当延伸（参考\sim 12 - 15 pc），这证实了我们以前在NGC 3256潮汐尾中发现的效应，那里的星团也同样延伸。我们发现，恒星和团簇形成可以进行在一个连续的步伐，至少\sim 150万年内的潮汐碎片的相互作用的星系。TDG候选者的光谱主要由年轻人口（\sim 700万年）主导，假设整个地区的年龄是单一的，其质量至少为10^6 M \odot。
英文摘要：
We present a spectroscopic survey of 21 young massive clusters and complexes and one tidal dwarf galaxy candidate (TDG) in Stephan's Quintet, an interacting compact group of galaxies. All of the selected targets lie outside the main galaxies of the system and are associated with tidal debris. We find clusters with ages between a few and 125 Myr and confirm the ages estimated through HST photometry by Fedotov et al. (2011), as well as their modelled interaction history of the Quintet. Many of the clusters are found to be relatively long-lived, given their spectrosopically derived ages, while their high masses suggest that they will likely evolve to eventually become intergalactic clusters. One cluster, T118, is particularly interesting, given its age (\sim 125 Myr), high mass (\sim 2\times10^6 M\odot) and position in the extreme outer end of the young tidal tail. This cluster appears to be quite extended (Reff \sim 12 - 15 pc) compared to clusters observed in galaxy disks (Reff \sim 3 - 4 pc), which confirms an effect we previously found in the tidal tails of NGC 3256, where clusters are similarly extended. We find that star and cluster formation can proceed at a continuous pace for at least \sim 150 Myr within the tidal debris of interacting galaxies. The spectrum of the TDG candidate is dominated by a young population (\sim 7 Myr), and assuming a single age for the entire region, has a mass of at least 10^6 M\odot.
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